Radio Network Node, User Plane Function (UPF) and Methods Performed Therein for Paging Policy Differentiation

ABSTRACT

A radio network node in a radio access network (RAN) and a method therein for Paging Policy Differentiation (PPD). The radio network node receives from a core network a Downlink (DL) Protocol Data Unit (PDU) associated with a wireless device. The DL PDU is comprised in a Quality of Service (QoS)-flow, is originated from a respective service, and comprises a Paging Policy Indicator (PPI) associated with the respective service. The radio network node extracts the PPI by means of a Central Unit User Plane (CU-UP). By means of the CU-UP, the radio network node informs a Central Unit Control Plane (CU-CP) about the PPI. Further, by means of the CU-CP, the radio network node triggers paging of the wireless device. Furthermore, the radio network node pages the wireless device according to the PPI associated with the respective service.

TECHNICAL FIELD

Embodiments herein relate to a radio network node, a User Plane Function(UPF) and methods performed therein. Furthermore, a computer programproduct and a computer readable storage medium are also provided herein.In particular, embodiments herein relate to Paging PolicyDifferentiation (PDD).

BACKGROUND

In a typical wireless communication network, wireless devices, alsoknown as wireless communication devices, mobile stations, stations(STAs) and/or user equipments (UEs), communicate via a Radio AccessNetwork (RAN) to one or more core networks (CNs). The RAN covers ageographical area which is divided into service areas or cells, witheach service area or cell being served by a radio network node such as aradio access node e.g., a Wi-Fi access point or a Radio Base Station(RBS), which in some networks may also be denoted, for example, a“NodeB” (NB) or “eNodeB” (eNB), “gNodeB” (gNB). A service area or cellis a geographical area where radio coverage is provided by the radionetwork node. The radio network node communicates over an air interfaceoperating on radio frequencies with the wireless device within range ofthe radio network node.

A Universal Mobile Telecommunications System (UMTS) is a ThirdGeneration (3G) telecommunication network, which evolved from the SecondGeneration (2G) Global System for Mobile Communications (GSM). The UMTSTerrestrial Radio Access Network (UTRAN) is essentially a RAN usingWideband Code Division Multiple Access (WCDMA) and/or High Speed PacketAccess (HSPA) for wireless devices. In a forum known as the ThirdGeneration Partnership Project (3GPP), telecommunications supplierspropose and agree upon standards for third generation networks, andinvestigate enhanced data rate and radio capacity. In some RANs, e.g. asin UMTS, several radio network nodes may be connected, e.g., bylandlines or microwave, to a controller node, such as a Radio NetworkController (RNC) or a Base Station Controller (BSC), which supervisesand coordinates various activities of the plural radio network nodesconnected thereto. This type of connection is sometimes referred to as abackhaul connection. The RNCs and BSCs are typically connected to one ormore core networks.

Specifications for the Evolved Packet System (EPS), also called a FourthGeneration (4G) network, have been completed within the 3^(rd)Generation Partnership Project (3GPP) and this work continues in thecoming 3GPP releases, for example to specify a Fifth Generation (5G)network. The EPS comprises the Evolved Universal Terrestrial RadioAccess Network (E-UTRAN), also known as the Long Term Evolution (LTE)radio access network, and the Evolved Packet Core (EPC), also known asSystem Architecture Evolution (SAE) core network. E-UTRAN/LTE is avariant of a 3GPP radio access network wherein the radio network nodesare directly connected to the EPC core network rather than to RNCs. Ingeneral, in E-UTRAN/LTE the functions of an RNC are distributed betweenthe radio network nodes, e.g. eNodeBs in LTE, and the core network. Assuch, the RAN of an EPS has an essentially “flat” architecturecomprising radio network nodes connected directly to one or more corenetworks, i.e. they are not connected to RNCs. To compensate for that,the E-UTRAN specification defines a direct interface between the radionetwork nodes, this interface being denoted the X2 interface. EPS is theEvolved 3GPP Packet Switched Domain. New generation Radio (NR) is a newradio access technology being standardized in 3GPP.

New Generation Radio Access Network (NG-RAN) Architecture

The NG-RAN may also be referred to as a 5 Generation Radio AccessNetwork (5G RAN). The current 5G RAN, i.e., NG-RAN architecture isdescribed in 3GPP TS 38.401.

The NG architecture can be further described as follows:

-   -   The NG-RAN comprises a set of gNBs connected to a New Generation        Core Network (NGC), which may also be referred to as 5        Generation Core Network (5GC) through a New Generation (NG)        interface.    -   A gNB can support Frequency-Division Duplex (FDD) mode        operation, Time-Division Duplex (TDD) mode operation or dual        mode operation.    -   gNBs can be interconnected through an Xn interface, which may        comprise an Xn Control plane (Xn-C) interface and an Xn User        plane (Xn-U) interface.    -   A gNB may comprise a gNB Central Unit (CU) (gNB-CU) and gNB        Decentralized Units (DUs) (gNB-DUs).    -   A gNB-CU and a gNB-DU are connected via an F1 logical interface.    -   One gNB-DU is connected to only one gNB-CU.

The NG, Xn and F1 are logical interfaces. For the NG-RAN, the NG andXn-C interfaces for a gNB comprising a gNB-CU and gNB-DUs, terminate inthe gNB-CU. For E-UTRA-NR Dual Connectivity (EN-DC), a S1 User plane(S1-U) and an X2 Control plan (X2-C) interfaces for a gNB terminate inthe gNB-CU. The gNB-CU and connected gNB-DUs are only visible to othergNBs and the 5GC as a gNB.

The NG-RAN is layered into a Radio Network Layer (RNL) and a TransportNetwork Layer (TNL). The NG-RAN architecture, i.e. the NG-RAN logicalnodes and interfaces between them, is defined as part of the RNL. Foreach NG-RAN interface, e.g. for each one of the NG, Xn, F1 interfaces,the related TNL protocol and the functionality are specified. The TNLprovides services for user plane transport and signaling transport. Inthe NG-Flex configuration, each gNB is connected to all Access andMobility Functions (AMFs) within an AMF Region. The AMF Region isdefined in 3GPP TS 23.501.

The general principles for the specification of the F1 interface are asfollows:

-   -   the F1 interface is to be open;    -   the F1 interface supports the exchange of signaling information        between the endpoints, and in addition the F1 interface may        support data transmission to the respective endpoints;    -   from a logical standpoint, the F1 interface is a point-to-point        interface between the endpoints. A point-to-point logical        interface should be feasible even in the absence of a physical        direct connection between the endpoints;    -   the F1 interface supports control plane and user plane        separation, via the F1-C and F1-U interfaces, respectively;    -   the F1 interface separates the Radio Network Layer and the        Transport Network Layer;    -   the F1 interface enables exchanges of UE associated information        and non-UE associated information;    -   the F1 interface is defined to be future proof to fulfill        different new requirements, support new services and new        functions;    -   one gNB-CU and a set of gNB-DUs are visible to other logical        nodes, such as a gNB. The gNB terminates the X2, the Xn, the NG        and the S1-U interfaces;    -   the CU may be separated in Control Plane (CP) and User Plane        (UP).

The 3GPP RAN Working Group 3 (WG3) has started working on a splitarchitecture of a gNB, which split architecture comprises a new openinterface between the Control Plane (CU-CP) and the User Planes (CU-UP)of the CU. The related agreements are collected in the 3GPP TR 38.806document. The open interface between the CU-CP and the CU-UP is namedE1, i.e. the E1 interface. The split architecture is shown in FIG. 2.

Three deployment scenarios for the split architecture of the gNB areshown in the 3GPP TR 38.806 document:

-   -   Scenario 1: the CU-CP and the CU-UP are centralized;    -   Scenario 2: the CU-CP is distributed and the CU-UP is        centralized;    -   Scenario 3: the CU-CP is centralized and the CU-UP is        distributed.

An E1 Application Protocol (E1AP) is defined in the 3GPP TS 38.463document. The E1AP defines the messages that are exchanged between theCU-CP and the CU-UP for the sake of providing user-plane services to theUE over the E1 interface.

Paging Policy Differentiation in NG-RAN

Paging in a network, i.e. in a communications network, is used to informand/or notify a UE about various events. In other words, paging is amechanism in which the network tells the UE: “I have something for you”.Then the UE decodes a content, e.g. the paging cause, of a pagingmessage and the UE may initiate a corresponding procedure.

In most cases, a paging procedure happens while the UE is in an idlemode. This means that the UE may monitor whether the network is sendingany paging message to it and it may spend some energy, e.g. battery, torun this “Monitoring” process.

Paging Policy Differentiation (PPD) is an optional feature that allowsthe AMF, based on operator configuration, to apply different pagingstrategies for different traffic or service types provided within thesame Protocol Data Unit (PDU) Session. In the 3GPP standard Rel-15 thisfeature applies only to the PDU session of Internet Protocol (IP) type.

When the 5G System (5GS) supports the Paging Policy Differentiation(PPD) feature, a Differentiated Services Code Point (DSCP) value is setby an application to indicate to the 5GS which Paging Policy should beapplied for a certain IP packet. The DSCP value may be carried in a TypeOf Service (ToS) field in a IP version 4 (IPv4) header or in a TrafficClass (TC) field in a IP version 6 (IPv6) header. For example, asdefined in the 3GPP TS 23.228 document, a Proxy Call Session ControlFunction (P-CSCF) may support PPD by marking packet(s) to be senttowards the UE that relate to a specific IP Multimedia Subsystem (IMS)service. The specific IMS service may for example be conversationalvoice as defined in the IMS multimedia telephony service.

It may be possible for the operator to configure the System ManagementFacility (SMF) in such a way that the PPD feature only applies tocertain Home Public Land Mobile Networks (HPLMNs), Digital News Networks(DNNs) and 5G Quality of Service (QoS) Indicators (5QIs). In the case ofHome Routed (HR) roaming, this configuration is done in the SMF in theVisited PLMN (VPLMN). Support of PPD in the case of HR roaming requiresinter operator agreements including on the DSCP value associated withthis feature.

In the case of Network Triggered Service Request and User Plane Function(UPF) buffering downlink (DL) data packet, the UPF may include the DSCPin the Type of Service (TOS) (IPv4) value or in the Transmission Control(TC) (IPv6) value from the IP header of the downlink data packet and anindication of the corresponding QoS Flow in the data notificationmessage sent to the SMF. When the PPD applies, the SMF determines aPaging Policy Indicator (PPI) based on the DSCP received from the UPF.

In the case of Network Triggered Service Request and SMF bufferingdownlink data packet, when the PPD applies, the SMF determines the PPIbased on the DSCP in the TOS (IPv4) value and/or TC (IPv6) value fromthe IP header of the received downlink data packet and identifies thecorresponding QoS Flow from a QoS Flow ID (QFI) of the received downlinkdata packet.

The SMF includes the PPI, a Retention Priority, e.g. an Allocation andRetention Priority, (ARP) and the 5QI of the corresponding QoS Flow in aN11 message sent to the AMF. If the UE is in Connection Management (CM)IDLE, the AMF uses this information to derive a paging strategy andsends paging messages to the NG-RAN over a N2 interface. The networkconfiguration needs to ensure that the information used as a trigger forPaging Policy Indication is not changed within the 5GS. Further, thenetwork configuration needs to ensure that the specific DSCP in the TOS(IPv4) value and/or in the TC (IPv6) value, used as a trigger for PagingPolicy Indication, is managed correctly in order to avoid the accidentaluse of certain paging policies.

The SMF may configure the UPF in such a way that traffic with the sameQoS but different paging differentiation requirements is transferred indifferent QoS Flows. In addition, the SMF may indicate over the N2interface to the NG-RAN the Paging Policy Indicator (PPI) for a QoS Flow(QFI) so that for a UE in Radio Resource Control (RRC) Inactive statethe NG-RAN may enforce specific paging policies in the case of NG-RANpaging, based on the 5QI, the ARP and this PPI associated with the QFIof an incoming DL PDU.

The current solution for applying Paging Policy Differentiation for RANPaging is the following:

-   -   The AMF sends to the CU-CP a paging policy for each QoS-Flow        over the NG-C interface:    -   The AMF can use either the PDU Session Resource Setup Request        message or the PDU Session Resource Modify message to provide        the paging policy (PPI: Paging Policy Indicator) for each        QoS-Flow in a PDU Session to the CU-CP. For more information see        3GPP TS 38.413, NG Application Protocol (NGAP).    -   NOTE: the AMF sends the paging policies (e.g. the PPIs) to the        CU-CP when the UE is connected state (RRC_CONNECTED).    -   The CU-CP stores the PPI for each QoS-Flow.    -   The CU-CP decides to send the UE to inactive state (RRC        INACTIVE).    -   NOTE: This requires a state transition from RRC_CONNECTED to        RRC_INACTIVE. How and when the CU-CP decides to perform the        state transition is not relevant for this disclosure.    -   The CU-CP informs the CU-UP when the UE enters inactive state        over the E1 interface using the Bearer Context Modification        procedure.    -   The CU-UP may receive traffic in DL from the 5GC over the NG-U        interface for an inactive UE.    -   The CU-UP informs the CU-CP about the incoming DL traffic over        the E1 interface using the DL Data Notification procedure.    -   The CU-CP triggers RAN Paging.    -   The CU-CP applies the paging policy (e.g. the PPI) for the        QoS-Flow for which DL traffic has been detected over the NG-U        interface.

SUMMARY

An object of embodiments herein is to provide a mechanism for improvingperformance of the wireless communication network in an efficientmanner.

According to an aspect the object is achieved by providing a methodperformed by a radio network node for Paging Policy Differentiation(PPD). The radio network node receives from a core network, a Downlink(DL) Protocol Data Unit (PDU) associated with a wireless device. The DLPDU is comprised in a Quality of Service (QoS)-flow. The DL PDU isoriginated from a respective service. The DL PDU comprises a PagingPolicy Indicator (PPI) associated with the respective service. The radionetwork node extracts the PPI by means of a Central Unit User Plane(CU-UP) of the radio network node. By means of the CU-UP, the radionetwork node informs a Central Unit Control Plane (CU-CP) of the radionetwork node about the PPI. By means of the CU-UP, the radio networknode triggers paging of the wireless device. Further, the radio networknode performs paging of the wireless device according to the PPIassociated with the respective service. Thereby, the PPD is provided.

According to another aspect the object is achieved by providing a methodperformed by a User Plane Function (UPF) for Paging PolicyDifferentiation (PPD). The UPF sends a downlink (DL) Protocol Data Unit(PDU) associated with a wireless device to a radio network node which isin a radio access network. The DL PDU is comprised in a Quality ofService (QoS)-flow. The DL PDU is originated from a respective service.The DL PDU comprises a Paging Policy Indicator (PPI) associated with therespective service.

According to still another aspect the object is achieved by providing aradio network node for Paging Policy Differentiation (PPD). The radionetwork node is configured to receive from a core network, a Downlink(DL) Protocol Data Unit (PDU) associated with a wireless device. The DLPDU is comprised in a Quality of Service (QoS)-flow. The DL PDU isoriginated from a respective service. The DL PDU comprises a PagingPolicy Indicator (PPI) associated with the respective service. The radionetwork node is further configured to extract the PPI by means of aCentral Unit User Plane (CU-UP) of the radio network node. By means ofthe CU-UP, the radio network node is configured to inform a Central UnitControl Plane (CU-CP) of the radio network node about the PPI. By meansof the CU-UP, the radio network node is configured to trigger paging ofthe wireless device. Further, the radio network node is configured toperform paging the wireless device according to the PPI associated withthe respective service. Thereby, the PPD is provided.

According to yet another aspect the object is achieved by providing aUser Plane Function (UPF) for Paging Policy Differentiation (PPD). TheUPF is configured to send a downlink (DL) Protocol Data Unit (PDU)associated with a wireless device to a radio network node which is in aradio access network. The DL PDU is comprised in a Quality of Service(QoS)-flow. The DL PDU is originated from a respective service. The DLPDU comprises a Paging Policy Indicator (PPI) associated with therespective service.

It is furthermore provided herein a computer program product comprisinginstructions, which, when executed on at least one processor, cause theat least one processor to carry out any of the methods above, asperformed by the radio network node or the UPF. It is additionallyprovided herein a computer-readable storage medium, having storedthereon a computer program product comprising instructions which, whenexecuted on at least one processor, cause the at least one processor tocarry out the method according to any of the methods above, as performedby the radio network node or the UPF.

According to still another aspect the object is achieved by providing aradio network node comprising processing circuitry configured to receivefrom a core network, a Downlink (DL)

Protocol Data Unit (PDU) associated with a wireless device. The DL PDUis comprised in a Quality of Service (QoS)-flow. The DL PDU isoriginated from a respective service. The DL PDU comprises a PagingPolicy Indicator (PPI) associated with the respective service. Theprocessing circuitry is further configured to extract the PPI, to informa Central Unit Control Plane (CU-CP) of the radio network node about thePPI, and to trigger paging of the wireless device. Further, the radionetwork node is configured to perform paging of the wireless deviceaccording to the PPI associated with the respective service.

According to still another aspect the object is achieved by providing aUser Plane Function (UPF) comprising processing circuitry configured tosend a downlink (DL) Protocol Data Unit (PDU) associated with a wirelessdevice to a radio network node which is in a radio access network. TheDL PDU is comprised in a Quality of Service (QoS)-flow. The DL PDU isoriginated from a respective service. The DL PDU comprises a PagingPolicy Indicator (PPI) associated with the respective service.

Embodiments herein provide an enhanced PPD, where paging policies arefurther differentiated for different services within the same QoS-flow.Thanks to the PPI per service within the same QoS-flow, the DL PDUs ofthe different services in the same QoS-Flow are dealt with differently.Due to the PPI per service within the same QoS-flow is carried in the DLPDU, the paging of the wireless device is directly performed based on DLPDU by the radio network node.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described in more detail in relation to theenclosed drawings, in which:

FIG. 1 is a schematic overview depicting a new generation wirelesscommunication network architecture according to embodiments herein;

FIG. 2 is a schematic overview depicting a split gNB architectureaccording to embodiments herein;

FIG. 3a is a schematic overview depicting a wireless communicationnetwork according to embodiments herein;

FIG. 3b is a schematic overview depicting a split architecture of aradio network node according to embodiments herein;

FIG. 4a -FIG. 4b are flowcharts depicting methods performed by a radionetwork node according to embodiments herein;

FIG. 5 is a flowchart depicting a method performed by a UPF according toembodiments herein;

FIG. 6 is a combined signaling scheme and flowchart according toembodiments herein;

FIG. 7 is a diagram depicting a DL PDU Session Information frameaccording to embodiments herein;

FIG. 8 is a diagram depicting a DL Data Notification message accordingto embodiments herein;

FIG. 9 is a block diagram depicting a radio network node according toembodiments herein;

FIG. 10 is a block diagram depicting a UPF according to embodimentsherein; and

FIG. 11-FIG. 16 are flowcharts illustrating methods implemented in acommunication system including a host computer, a base station and auser equipment.

DETAILED DESCRIPTION

Embodiments herein relate to wireless communication networks in general.FIG. 3a is a schematic overview depicting a wireless communicationnetwork 1. The wireless communication network 1 comprises one or moreRANs e.g. a first RAN RAN1, connected to one or more CNs CN1, e.g.,5GCs. The wireless communication network 1 may use one or moretechnologies, such as Wi-Fi, Long Term Evolution (LTE), LTE-Advanced,5G, Wideband Code Division Multiple Access (WCDMA), Global System forMobile communications/Enhanced Data rate for GSM Evolution (GSM/EDGE),Worldwide Interoperability for Microwave Access (WiMax), or Ultra MobileBroadband (UMB), just to mention a few possible implementations.Embodiments herein relate to recent technology trends that are ofparticular interest in a 5G context, however, embodiments are applicablealso in further development of the existing communication systems suchas e.g. 3G and LTE.

In the wireless communication network 1, wireless devices e.g. awireless device 10 such as a mobile station, a non-access point (non-AP)station (STA), a STA, a user equipment and/or a wireless terminal, areconnected via the one or more RANs RAN1, to the one or more CNs CN1,e.g., 5GCs. It should be understood by those skilled in the art that“wireless device” is a non-limiting term which means any terminal,wireless communication terminal, communication equipment, Machine TypeCommunication (MTC) device, Device to Device (D2D) terminal, or userequipment e.g. smart phone, laptop, mobile phone, sensor, relay, mobiletablets or any device communicating within a cell or service area. Thewireless device 10 searches for carriers using a carrier raster. Thecarrier raster indicating possible frequency positions of a carrier forthe wireless device.

The wireless communication network 1 comprises a radio network node 12.The radio network node 12 is exemplified herein as a RAN node providingradio coverage over a geographical area, a first service area 11, of aRadio Access Technology (RAT), such as NR, LTE, UMTS, Wi-Fi or similar.The radio network node 12 may be a radio access network node such asradio network controller or an access point such as a Wireless LocalArea Network (WLAN) access point or an Access Point Station (AP STA), anaccess controller, a base station, e.g. a radio base station such as aNodeB, a gNodeB, an evolved Node B (eNB, eNodeB), a base transceiverstation, Access Point Base Station, base station router, a transmissionarrangement of a radio base station, a stand-alone access point or anyother network unit capable of serving a wireless device 10 within theservice area served by the radio network node 12 depending e.g. on theradio access technology and terminology used and may be denoted as areceiving radio network node. The radio network node 12 mayalternatively be a core network node such as an MME or controllingnetwork node.

It should be noted that a service area may be denoted as cell, beam,beam group or similar to define an area of radio coverage.

Embodiments herein are related to Paging Policy Differentiation (PPD),e.g., for Inactive UEs in a NG-RAN.

In the conventional solution, different services, i.e., differentservice data flows, may be mapped on the same QoS-Flow. However eachservice may require a different paging policy. For example: InstantMessage (IM) over IMS and voice over IMS may be mapped on the sameQoS-Flow, but these two services may require different paging policies.

The conventional solution only allows different paging policies fordifferent QoS-Flows, and does not allow applying different pagingpolicies for services that are mapped on the same QoS-Flow.

The embodiments herein provide different paging policies for differentservices that are mapped on the same QoS-Flow. The paging policy isindicated by a Paging Policy Indicator (PPI).

The terms paging policy indicator and paging priority indicator areinterchangeable in this disclosure.

FIG. 3b schematically illustrates a split architecture of the radionetwork node 12 according to embodiments described herein. The splitarchitecture relates to the split architecture schematically illustratedin FIG. 2. As schematically illustrated, the split architecturecomprises a new open interface between the Central Unit Control Plane(CU-CP) 12 a and the Control Unit User Planes (CU-UP) 12 b. The openinterface between the CU-CP 12 a and the one or more CU-UPs 12 b isnamed the E1 interface. As previously mentioned, the E1 AP defines themessages that are exchanged between the CU-CP 12 a and the CU-UP 12 bfor the sake of providing user-plane services to the UE 10 over the E1interface.

Further, the core network CN1 of FIG. 3b comprises an AMF and an UPF 15which may communicate with the radio network node 12 over the NG-Cinterface and the NG-U interface, respectively.

The method actions performed by a radio network node 12 in a RadioAccess Network (RAN), e.g. the RAN1, for Paging Policy Differentiation(PPD) according to embodiments herein will now be described withreference to a flowchart depicted in FIG. 4a , together with FIG. 6which is a schematic combined signaling scheme and flowchart depictingembodiments herein. Thus, the radio network node 12 performs action forPPD. As previously mentioned, the radio network node 12 is comprised inthe RAN1. The actions do not have to be taken in the order stated below,but may be taken in any suitable order. Actions performed in someembodiments may be marked with dashed boxes.

Action S410. In embodiments herein, the radio network node 12 mayreceive a downlink (DL) Protocol Data Unit (PDU) from a core network,e.g. the core network CN1 in FIGS. 3a and 3b . The DL PDU is associatedwith a wireless device 10, e.g., for informing and/or notifying thewireless device 10 about an event. The DL PDU may be comprised in aQuality of Service (QoS)-flow. The DL PDU may be originated from arespective service. The DL PDU may comprise a Paging Policy Indicator(PPI) associated with the respective service. That is to say, the DL PDUmay comprise a Paging Policy Indicator (PPI) per service within theQoS-flow. Thus, embodiments herein provide different paging policies fordifferent services' DL PDUs that are mapped on the same QoS-Flow.

One QoS-flow may comprise plurality of DL PDUs. The DL PDUs may beassociated with different services. However all DL PDUs in one QoS-flowmay have a same QoS requirement. In other words, PDUs, though beingoriginated from different services, may be mapped to the same QoS-Flowas long as the PDUs have the same QoS requirement. The term QoS-Flowherein may refer to a flow of PDUs with a specific QoS requirement. Thisflow may comprise PDUs associated with different services, e.g., IM,voice, video etc.

The DL PDU may be any frame transmitted from the core network CN1 to theradio network node 12. The PPI may be carried in any field of the DLPDU. According to an unlimited example shown in FIG. 7, the DL PDU maybe a DL PDU session information frame, and the PPI may be carried in aspare field of the DL PDU session information frame.

The DL PDU itself may not be sent to the wireless device 10. Howeverthis DL PDU may contain data for the wireless device 10, if so, the datamay be sent to the wireless device 10 after the paging procedure isdone.

Action S450. Based on the DL PDU associated with the wireless device 10,the radio network node 12 may perform paging of the wireless device 10according to the PPI associated with the respective service, i.e., thePPI per service within the QoS-flow.

Embodiments herein provide an enhanced PPD, where paging policies arefurther differentiated for different services within the same QoS-flow.Thanks to different services configured with different PPIs, the DL PDUsof the different services in the same QoS-Flow are accordingly dealtwith differently. Due to the PPI per service within the same QoS-flow iscarried in the DL PDU, the paging of the wireless device 10 may bedirectly performed based on the DL PDU by the radio network node 12.

According to some embodiments, the radio network node 12 may have theabove split architecture as shown in FIGS. 2 and 3 b. In such a case,the radio network node 12 may comprise the CU and the DUs. The CU maycomprise the Control Plane (CU-CP) 12 a and the User Plane (CU-UP) 12 b.The CU-CP 12 a and one DU may communicate via the F1-C interface. TheCU-UP 12 b and one DU may communicate via the F1-U interface. The E1interface may be employed between the CU-CP 12 a and the CU-UP 12 b ofthe CU. More related agreements on the split architecture may also becollected in the 3GPP TR 38.806 document.

When the radio network node 12 has the above split architecture, themethod actions performed by the radio network node 12 in the radioaccess network RAN1 for Paging Policy Differentiation (PPD) will befurther explained herein. Embodiments herein will now be described withreference to a flowchart depicted in FIG. 4b , together with FIG. 6which is a schematic combined signaling scheme and flowchart. Theactions do not have to be taken in the order stated below, but may betaken in any suitable order. Actions performed in some embodiments maybe marked with dashed boxes.

Action S410. It may be the Central Unit User Plane (CU-UP) 12 b of theradio network node 12 that receives the DL PDU with the PPI associatedwith the respective service, i.e., the PPI per service, e.g., from theUser Plane Function (UPF) 15 in the core network CN1, e.g., via the NewGeneration User plane (NG-U) interface.

Action S420. After receiving the DL PDU, the CU-UP 12 b of the radionetwork node 12 may extract, i.e., determine, the PPI carried therein.

Action S430. Next, the CU-UP 12 b of the radio network node 12 mayinform the CU-CP 12 a of the radio network node 12 of the PPI.

The PPI may be informed by using any message, e.g., a DL datanotification message as shown in FIG. 8, transmitted from the CU-UP 12 bto the CU-CP 12 a via, e.g. the E1 interface.

Action S440. Based on the PPI per service, the CU-CP 12 a of the radionetwork node 12 may trigger the paging of the wireless device 10.

Action S450. The CU-CP 12 a of radio network node 12 may perform thepaging of the wireless device 10 according to the PPI per service withinthe QoS-flow, e.g., carried in the DL data notification message.

By employing the mechanisms described herein, the provided enhanced PPDare applicable to any radio network node 12 having a split architecture.

Some embodiments are described in the context of NR, however the skilledperson will appreciate that the embodiments herein are also applied toother wireless communication system.

The method actions performed by the core network, e.g., the UPF 15 inthe core network, for Paging Policy Differentiation (PPD) according toembodiments herein will now be described with reference to a flowchartdepicted in FIG. 5, in together with FIG. 6. Thus, the UPF 15 performsactions for PPD. As previously mentioned, the UPF 15 is comprised in thecore network CN1. The actions do not have to be taken in the orderstated below, but may be taken in any suitable order. Actions performedin some embodiments may be marked with dashed boxes.

Action S510. In order to enable the enhanced PPD herein, the corenetwork CN1, e.g., the UPF 15 in the core network CN1, may configure aPPI associated with a respective service. I.e., the PPI is per service,e.g., one PPI for each (type of) service. For example, a first PPI maybe associated with an Instant Message (IM) over the IMS and a second PPImay be associated with voice over the IMS. Further, the two services,i.e. the IM over the IMS and the voice over the IMS in the givenexample, having the respective first and second PPI, will be mapped onthe same QoS-Flow.

Action S520. To implement the enhanced PPD, the core network CN1, e.g.,the UPF 15 in the core network CN, may send to the radio network node 12the UL PDU comprising the PPI associated with the respective service.

Thanks to the PPI per service within the QoS-flow, according toembodiments herein paging policies are further differentiated fordifferent services within the same QoS-flow.

The enhanced Paging Policy Differentiation (PPD) will now be furtherdescribed. The embodiments may comprise two parts as below.

1. The paging policy indicator may be added to the NG-U interface:

The NG-U interface is defined in the 3GPP TS 38.415 standard document.The paging policy indicator may be included for example in the DL PDUSession Information frame that is sent from the UPF 15 to the CU-UP 12 band may carry information for the delivery of the DL PDU. The frameformat is shown in FIG. 7. One option could be for example to use thespare bits (indicated as bold in FIG. 7) in this frame for including thePPI or another identifier for the paging policy.

2. The paging policy may be added into the DL Data Notification messageas shown in FIG. 8.

Once the CU-UP 12 b receives a DL PDU Session Information frame or ingeneral a DL PDU over the NG-U interface, e.g., for an inactive UE 10,it may extract the paging priority indicator and trigger a DL DataNotification procedure toward the CU-CP 12 a.

The DL Data Notification message may be extended to include the pagingpriority indicator. A possible solution to extend the DL DataNotification message is shown in FIG. 8.

The DL Data Notification message may be sent from the gNB-CU-UP, e.g.the CU-UP 12 b of the radio network node 12, to the gNB-CU-CP, e.g. theCU-CP 12 a of the radio network node 12.

Once the CU-CP 12 a receives this message, it may trigger RAN pagingwith the indicated paging priority indicator, which will be defined forthe specific service from which the DL data is originated.

In some embodiments, the UE 10, the gNB 12 and the UPF 15 areillustrated as examples of a wireless device, a radio network node andan entity in a core network, respectively. However the skilled personwill appreciate that the disclosed embodiments are equally applicable toany wireless device, any radio network node, and any entity in a corenetwork CN1 as in FIG. 3 a.

FIG. 9 is a block diagram depicting the radio network node 12 in a radioaccess network RAN1 for Paging Policy Differentiation (PPD) according toembodiments herein.

The radio network node 12 may comprise processing circuitry 901, e.g.one or more processors, configured to perform the methods herein.

The radio network node 12 may comprise the Central Unit User Plane(CU-UP) 12 b and the Central Unit Control Plane (CU-CP) 12 a (shown inFIG. 3b ).

The radio network node 12 may comprise a receiving module 910, e.g. areceiver or transceiver. The radio network node 12, the processingcircuitry 901, the receiving module 910 and/or the CU-UP 12 b may beconfigured to receive the DL PDU with the PPI associated with therespective service from the core network CN1. The DL PDU may beassociated with a wireless device 10, namely informing and/or notifyingthe wireless device 10 about an event. The DL PDU may be comprised in aQuality of Service (QoS)-flow. The DL PDU may comprise a Paging PolicyIndicator (PPI) per service within the QoS-flow.

The DL PDU may be any frame transmitted from the core network CN1 to theradio network node 12. The PPI may be carried in any field of the DLPDU. According to an unlimited example shown in FIG. 7, the DL PDU maybe a DL PDU session information frame, and the PPI may be carried in aspare field of the DL PDU session information frame.

The radio network node 12 may comprise an extracting module 911. Theradio network node 12, the processing circuitry 901, the extractingmodule 911 and/or the CU-UP 12 b may be configured to extract, i.e.,determine the PPI carried in the DL PDU.

The radio network node 12 may comprise an informing module 912. Theradio network node 12, the processing circuitry 901, the informingmodule 912 and/or the CU-UP 12 b may be configured to inform the CU-CP12 a of the PPI. The PPI may be informed by using any message, e.g., aDL data notification message as shown in FIG. 8.

The radio network node 12 may comprise a triggering module 913. Theradio network node 12, the processing circuitry 901, the triggeringmodule 913 and/or the CU-CP 12 a may be configured to trigger the pagingof the wireless device 10.

The radio network node 12 may comprise a paging module 914. The radionetwork node 12, the processing circuitry 901, the paging module 914and/or the CU-CP 12 a may be configured to perform the paging of thewireless device 10 according to the PPI per service within the QoS-flow.

The radio network node 12 may further comprise a memory 904. The memorycomprises one or more units to be used to store data on, such as thePPI, DL PDU, frame, and/or the message to perform the methods disclosedherein when being executed, and similar. Thus, the radio network node 12may comprise the processing circuitry and the memory, said memorycomprising instructions executable by said processing circuitry wherebysaid radio network node 12 is operative to perform the methods herein.

The methods according to the embodiments described herein for the radionetwork node 12 are respectively implemented by means of e.g. a computerprogram 905 or a computer program product 905, comprising instructions,i.e., software code portions, which, when executed on at least oneprocessor, cause the at least one processor to carry out the actionsdescribed herein, as performed by the radio network node 12. Thecomputer program product 905 may be stored on a computer-readablestorage medium 906, e.g. a disc, USB or similar. The computer-readablestorage medium 906, having stored thereon the computer program product905, may comprise the instructions which, when executed on at least oneprocessor, cause the at least one processor to carry out the actionsdescribed herein, as performed by the radio network node 12. In someembodiments, the computer-readable storage medium may be anon-transitory computer-readable storage medium.

FIG. 10 is a block diagram depicting by the core network CN1, e.g., theUPF 15 in the core network CN1, for Paging Policy Differentiation (PPD)according to embodiments herein.

The core network CN1, e.g., the UPF 15 in the core network CN1, maycomprise processing circuitry 1001, e.g. one or more processors,configured to perform the methods herein.

The core network CN1, e.g., the UPF 15 in the core network CN1, maycomprise a configuring module 1010. The core network CN1, e.g., the UPF15 in the core network CN1, the processing circuitry 1001 and/or theconfiguring module 1010 may configured to configure PPI per service,i.e., configure one PPI for each type of service.

The core network CN1, e.g., the UPF 15 in the core network CN1, maycomprise a sending module 1011, e.g. a transmitter or a transceiver. Thecore network CN1, e.g., the UPF 15 in the core network CN1, theprocessing circuitry 1001 and/or the sending module 1011 may furtherconfigured to send to the radio network node 12 the UL PDU comprisingthe PPI per service within the QoS-flow.

The core network CN1, e.g., the UPF 15 in the core network CN1, mayfurther comprise a memory 1004. The memory comprises one or more unitsto be used to store data on, such as UL grants, data, informationrelating to the DL PDUs, the services, the paging indicators, thewireless device and/or information relating to the radio network node toperform the methods disclosed herein when being executed, and similar.Thus, the core network CN1, e.g., the UPF 15 in the core network CN1,may comprise the processing circuitry and the memory, said memorycomprising instructions executable by said processing circuitry wherebysaid radio network node is operative to perform the methods herein.

The methods according to the embodiments described herein for the corenetwork CN1, e.g., the UPF 15 in the core network CN1, are respectivelyimplemented by means of e.g. a computer program 1005 or a computerprogram product 1005, comprising instructions, i.e., software codeportions, which, when executed on at least one processor, cause the atleast one processor to carry out the actions described herein, asperformed by the core network CN1, e.g., the UPF 15 in the core networkCN1. The computer program product 1005 may be stored on acomputer-readable storage medium 1006, e.g. a disc or similar. Thecomputer-readable storage medium 1006, having stored thereon thecomputer program product 1005, may comprise the instructions which, whenexecuted on at least one processor, cause the at least one processor tocarry out the actions described herein, as performed by the core networkCN1, e.g., the UPF 15 in the core network CN1. In some embodiments, thecomputer-readable storage medium may be a non-transitorycomputer-readable storage medium.

As will be readily understood by those familiar with communicationsdesign, that functions means or modules may be implemented using digitallogic and/or one or more microcontrollers, microprocessors, or otherdigital hardware. In some embodiments, several or all of the variousfunctions may be implemented together, such as in a singleApplication-Specific Integrated Circuit (ASIC), or in two or moreseparate devices with appropriate hardware and/or software interfacesbetween them. Several of the functions may be implemented on a processorshared with other functional components of an UPF, for example.

Alternatively, several of the functional elements of the processingmeans discussed may be provided through the use of dedicated hardware,while others are provided with hardware for executing software, inassociation with the appropriate software or firmware. Thus, the term“processor” or “controller” as used herein does not exclusively refer tohardware capable of executing software and may implicitly include,without limitation, Digital Signal Processor (DSP) hardware, Read-OnlyMemory (ROM) for storing software, random-access memory for storingsoftware and/or program or application data, and non-volatile memory.Other hardware, conventional and/or custom, may also be included.Designers of radio network nodes will appreciate the cost, performance,and maintenance trade-offs inherent in these design choices.

With reference to FIG. 11, in accordance with an embodiment, acommunication system includes a telecommunication network 3210, such asa 3GPP-type cellular network, which comprises an access network 3211,such as the radio access network RAN1, and a core network 3214, such asthe core network CN1. The access network 3211 comprises a plurality ofbase stations 3212 a, 3212 b, 3212 c, such as the radio network node 12,NBs, eNBs, gNBs or other types of wireless access points being examplesof the radio network nodes herein, each defining a correspondingcoverage area 3213 a, 3213 b, 3213 c. Each base station 3212 a, 3212 b,3212 c is connectable to the core network 3214 over a wired or wirelessconnection 3215. A first user equipment (UE) 3291, being an example ofthe wireless device 10, located in coverage area 3213 c is configured towirelessly connect to, or be paged by, the corresponding base station3212 c. A second UE 3292 in coverage area 3213 a is wirelesslyconnectable to the corresponding base station 3212 a. While a pluralityof UEs 3291, 3292 are illustrated in this example, the disclosedembodiments are equally applicable to a situation where a sole UE is inthe coverage area or where a sole UE is connecting to the correspondingbase station 3212.

The telecommunication network 3210 is itself connected to a hostcomputer 3230, which may be embodied in the hardware and/or software ofa standalone server, a cloud-implemented server, a distributed server oras processing resources in a server farm. The host computer 3230 may beunder the ownership or control of a service provider, or may be operatedby the service provider or on behalf of the service provider. Theconnections 3221, 3222 between the telecommunication network 3210 andthe host computer 3230 may extend directly from the core network 3214 tothe host computer 3230 or may go via an optional intermediate network3220. The intermediate network 3220 may be one of, or a combination ofmore than one of, a public, private or hosted network; the intermediatenetwork 3220, if any, may be a backbone network or the Internet; inparticular, the intermediate network 3220 may comprise two or moresub-networks (not shown).

The communication system of FIG. 11 as a whole enables connectivitybetween one of the connected UEs 3291, 3292 and the host computer 3230.The connectivity may be described as an over-the-top (OTT) connection3250. The host computer 3230 and the connected UEs 3291, 3292 areconfigured to communicate data and/or signaling via the OTT connection3250, using the access network 3211, the core network 3214, anyintermediate network 3220 and possible further infrastructure (notshown) as intermediaries. The OTT connection 3250 may be transparent inthe sense that the participating communication devices through which theOTT connection 3250 passes are unaware of routing of uplink and downlinkcommunications. For example, a base station 3212 may not or need not beinformed about the past routing of an incoming downlink communicationwith data originating from a host computer 3230 to be forwarded (e.g.,handed over) to a connected UE 3291. Similarly, the base station 3212need not be aware of the future routing of an outgoing uplinkcommunication originating from the UE 3291 towards the host computer3230.

Example implementations, in accordance with an embodiment, of the UE,base station and host computer discussed in the preceding paragraphswill now be described with reference to FIG. 12. In a communicationsystem 3300, a host computer 3310 comprises hardware 3315 including acommunication interface 3316 configured to set up and maintain a wiredor wireless connection with an interface of a different communicationdevice of the communication system 3300. The host computer 3310 furthercomprises processing circuitry 3318, which may have storage and/orprocessing capabilities. In particular, the processing circuitry 3318may comprise one or more programmable processors, application-specificintegrated circuits, field programmable gate arrays or combinations ofthese (not shown) adapted to execute instructions. The host computer3310 further comprises software 3311, which is stored in or accessibleby the host computer 3310 and executable by the processing circuitry3318. The software 3311 includes a host application 3312. The hostapplication 3312 may be operable to provide a service to a remote user,such as a UE 3330 connecting via an OTT connection 3350 terminating atthe UE 3330 and the host computer 3310. In providing the service to theremote user, the host application 3312 may provide user data which istransmitted using the OTT connection 3350.

The communication system 3300 further includes a base station 3320provided in a telecommunication system and comprising hardware 3325enabling it to communicate with the host computer 3310 and with the UE3330. The hardware 3325 may include a communication interface 3326 forsetting up and maintaining a wired or wireless connection with aninterface of a different communication device of the communicationsystem 3300, as well as a radio interface 3327 for setting up andmaintaining at least a wireless connection 3370 with a UE 3330 locatedin a coverage area (not shown in FIG. 12) served by the base station3320. The communication interface 3326 may be configured to facilitate aconnection 3360 to the host computer 3310. The connection 3360 may bedirect or it may pass through a core network (not shown in FIG. 12) ofthe telecommunication system and/or through one or more intermediatenetworks outside the telecommunication system. In the embodiment shown,the hardware 3325 of the base station 3320 further includes processingcircuitry 3328, which may comprise one or more programmable processors,application-specific integrated circuits, field programmable gate arraysor combinations of these (not shown) adapted to execute instructions.The base station 3320 further has software 3321 stored internally oraccessible via an external connection.

The communication system 3300 further includes the UE 3330 alreadyreferred to. Its hardware 3335 may include a radio interface 3337configured to set up and maintain a wireless connection 3370 with a basestation serving a coverage area in which the UE 3330 is currentlylocated. The hardware 3335 of the UE 3330 further includes processingcircuitry 3338, which may comprise one or more programmable processors,application-specific integrated circuits, field programmable gate arraysor combinations of these (not shown) adapted to execute instructions.The UE 3330 further comprises software 3331, which is stored in oraccessible by the UE 3330 and executable by the processing circuitry3338. The software 3331 includes a client application 3332. The clientapplication 3332 may be operable to provide a service to a human ornon-human user via the UE 3330, with the support of the host computer3310. In the host computer 3310, an executing host application 3312 maycommunicate with the executing client application 3332 via the OTTconnection 3350 terminating at the UE 3330 and the host computer 3310.In providing the service to the user, the client application 3332 mayreceive request data from the host application 3312 and provide userdata in response to the request data. The OTT connection 3350 maytransfer both the request data and the user data. The client application3332 may interact with the user to generate the user data that itprovides.

It is noted that the host computer 3310, base station 3320 and UE 3330illustrated in FIG. 12 may be identical to the host computer 3230, oneof the base stations 3212 a, 3212 b, 3212 c and one of the UEs 3291,3292 of FIG. 11, respectively. This is to say, the inner workings ofthese entities may be as shown in FIG. 12 and independently, thesurrounding network topology may be that of FIG. 11.

In FIG. 12, the OTT connection 3350 has been drawn abstractly toillustrate the communication between the host computer 3310 and the userequipment 3330 via the base station 3320, without explicit reference toany intermediary devices and the precise routing of messages via thesedevices. Network infrastructure may determine the routing, which it maybe configured to hide from the UE 3330 or from the service provideroperating the host computer 3310, or both. While the OTT connection 3350is active, the network infrastructure may further take decisions bywhich it dynamically changes the routing (e.g., on the basis of loadbalancing consideration or reconfiguration of the network).

The wireless connection 3370 between the UE 3330 and the base station3320 is in accordance with the teachings of the embodiments describedthroughout this disclosure. One or more of the various embodimentsimprove the performance of OTT services provided to the UE 3330 usingthe OTT connection 3350, in which the wireless connection 3370 forms thelast segment. More precisely, the teachings of these embodiments mayimprove transmissions as number of transitions between states may bereduced and thereby provide benefits such as reduced user waiting time,and better responsiveness.

A measurement procedure may be provided for the purpose of monitoringdata rate, latency and other factors on which the one or moreembodiments improve. There may further be an optional networkfunctionality for reconfiguring the OTT connection 3350 between the hostcomputer 3310 and UE 3330, in response to variations in the measurementresults. The measurement procedure and/or the network functionality forreconfiguring the OTT connection 3350 may be implemented in the software3311 of the host computer 3310 or in the software 3331 of the UE 3330,or both. In embodiments, sensors (not shown) may be deployed in or inassociation with communication devices through which the OTT connection3350 passes; the sensors may participate in the measurement procedure bysupplying values of the monitored quantities exemplified above, orsupplying values of other physical quantities from which software 3311,3331 may compute or estimate the monitored quantities. The reconfiguringof the OTT connection 3350 may include message format, retransmissionsettings, preferred routing etc.; the reconfiguring need not affect thebase station 3320, and it may be unknown or imperceptible to the basestation 3320. Such procedures and functionalities may be known andpracticed in the art. In certain embodiments, measurements may involveproprietary UE signaling facilitating the host computer's 3310measurements of throughput, propagation times, latency and the like. Themeasurements may be implemented in that the software 3311, 3331 causesmessages to be transmitted, in particular empty or ‘dummy’ messages,using the OTT connection 3350 while it monitors propagation times,errors etc.

FIG. 13 is a flowchart illustrating a method implemented in acommunication system, in accordance with one embodiment. Thecommunication system includes a host computer, a base station and a UEwhich may be those described with reference to FIG. 11 and FIG. 12. Forsimplicity of the present disclosure, only drawing references to FIG. 13will be included in this section. In a first step 3410 of the method,the host computer provides user data. In an optional substep 3411 of thefirst step 3410, the host computer provides the user data by executing ahost application. In a second step 3420, the host computer initiates atransmission carrying the user data to the UE. In an optional third step3430, the base station transmits to the UE the user data which wascarried in the transmission that the host computer initiated, inaccordance with the teachings of the embodiments described throughoutthis disclosure. In an optional fourth step 3440, the UE executes aclient application associated with the host application executed by thehost computer.

FIG. 14 is a flowchart illustrating a method implemented in acommunication system, in accordance with one embodiment. Thecommunication system includes a host computer, a base station and a UEwhich may be those described with reference to FIG. 11 and FIG. 12.

For simplicity of the present disclosure, only drawing references toFIG. 14 will be included in this section. In a first step 3510 of themethod, the host computer provides user data. In an optional substep(not shown) the host computer provides the user data by executing a hostapplication. In a second step 3520, the host computer initiates atransmission carrying the user data to the UE. The transmission may passvia the base station, in accordance with the teachings of theembodiments described throughout this disclosure. In an optional thirdstep 3530, the UE receives the user data carried in the transmission.

FIG. 15 is a flowchart illustrating a method implemented in acommunication system, in accordance with one embodiment. Thecommunication system includes a host computer, a base station and a UEwhich may be those described with reference to FIG. 11 and FIG. 12. Forsimplicity of the present disclosure, only drawing references to FIG. 15will be included in this section. In an optional first step 3610 of themethod, the UE receives input data provided by the host computer.Additionally or alternatively, in an optional second step 3620, the UEprovides user data. In an optional substep 3621 of the second step 3620,the UE provides the user data by executing a client application. In afurther optional substep 3611 of the first step 3610, the UE executes aclient application which provides the user data in reaction to thereceived input data provided by the host computer. In providing the userdata, the executed client application may further consider user inputreceived from the user. Regardless of the specific manner in which theuser data was provided, the UE initiates, in an optional third substep3630, transmission of the user data to the host computer. In a fourthstep 3640 of the method, the host computer receives the user datatransmitted from the UE, in accordance with the teachings of theembodiments described throughout this disclosure.

FIG. 16 is a flowchart illustrating a method implemented in acommunication system, in accordance with one embodiment. Thecommunication system includes a host computer, a base station and a UEwhich may be those described with reference to FIG. 11 and FIG. 12. Forsimplicity of the present disclosure, only drawing references to FIG. 16will be included in this section. In an optional first step 3710 of themethod, in accordance with the teachings of the embodiments describedthroughout this disclosure, the base station receives user data from theUE. In an optional second step 3720, the base station initiatestransmission of the received user data to the host computer. In a thirdstep 3730, the host computer receives the user data carried in thetransmission initiated by the base station.

It will be appreciated that the foregoing description and theaccompanying drawings represent non-limiting examples of the methods andapparatus taught herein. As such, the apparatus and techniques taughtherein are not limited by the foregoing description and accompanyingdrawings. Instead, the embodiments herein are limited only by thefollowing claims and their legal equivalents.

More Embodiments Group A Embodiments

-   1. A method performed by a radio network node in a radio access    network for paging policy differentiation (PPD), the method    comprising:    -   receiving from a core network, a Downlink (DL) Protocol Data        Unit (PDU) associated with a wireless device, wherein the DL PDU        is comprised in a Quality of Service (QoS)-flow, the DL PDU is        originated from a respective service, and the DL PDU comprises a        Paging Policy Indicator (PPI) associated with the respective        service; and    -   paging the wireless device according to the PPI associated with        the respective service.    -   For example, the DL PDU is comprised in a Quality of Service        (QoS)-flow, wherein the QoS-flow comprises DL PDUs, each DL PDU        is originated from a respective service, and wherein DL PDU        comprised in the QoS-flow comprises a Paging Policy Indicator        (PPI) associated with the respective service.-   2. The method of the embodiment 1, the method further comprising any    one or more of:    -   extract, e.g., by a Central Unit User Plane (CU-UP) of the radio        network node, the PPI;    -   informing, e.g., a Central Unit Control Plane (CU-CP) of the        radio network node, of the PPI, the informing is performed,        e.g., by the CU-UP; and    -   triggering, e.g., by the CU-CP, the paging.-   3. The method of the embodiment 2, the method further comprising:    -   informing, e.g., the CU-CP, of the PPI by using a DL data        notification message via an E1 interface, the informing is        performed, e.g., by the CU-UP.-   4. The method of any of the previous embodiments, the method further    comprising:    -   receiving, e.g., by a central unit user plane (CU-UP) of the        radio network node, the DL PDU, e.g., from a user plane function        (UPF) in the core network, e.g., via a new generation user plane        (NG-U) interface.

Group B Embodiments

-   5. A method performed by a user plane function (UPF) in a core    network for paging policy differentiation (PPD), the method    comprising:    -   sending a downlink (DL) protocol data unit (PDU) associated with        a wireless device to a radio network node which is in a radio        access network, wherein the DL PDU is comprised in a Quality of        Service (QoS)-flow, the DL PDU is originated from a respective        service, and the DL PDU comprises a Paging Policy Indicator        (PPI) associated with the respective service.-   6. The method of the embodiment 5, the method further comprising:    -   sending the DL PDU to a central unit user plane (CU-UP) of the        radio network node, via a new generation user plane (NG-U)        interface.

Group C Embodiments

-   7. A radio network node in a radio access network for paging policy    differentiation (PPD), the radio network node is configured to:    -   receive from a core network, a Downlink (DL) Protocol Data Unit        (PDU) associated with a wireless device, wherein the DL PDU is        comprised in a Quality of Service (QoS)-flow, the DL PDU is        originated from a respective service, and the DL PDU comprises a        Paging Policy Indicator (PPI) associated with the respective        service; and    -   perform paging the wireless device according to the PPI        associated with the respective service.-   8. The radio network node of the embodiment 7, the radio network    node is further configured to:    -   extract, e.g., by a Central Unit User Plane (CU-UP) of the radio        network node, the PPI;    -   inform, e.g., a Central Unit Control Plane (CU-CP) of the radio        network node, of the PPI, the informing is performed, e.g., by        the CU-UP; and    -   trigger, e.g., by the CU-CP, the paging.-   9. The radio network node of the embodiment 8, the radio network    node is further configured to:    -   informing, e.g., the CU-CP, of the PPI by using a DL data        notification message via an E1 interface, the informing is        performed, e.g., by the CU-UP.-   10. The radio network node of any one of the embodiments 7-9, the    radio network node is further configured to:    -   receiving, e.g., by a central unit user plane (CU-UP) of the        radio network node, the DL PDU, e.g., from a user plane function        (UPF) in the core network, e.g., via a new generation user plane        (NG-U) interface.

Group D Embodiments

-   11. A user plane function (UPF) in a core network for paging policy    differentiation (PPD), the UPF is configured to:    -   send a downlink (DL) protocol data unit (PDU) associated with a        wireless device to a radio network node which is in a radio        access network, wherein the DL PDU is comprised in a Quality of        Service (QoS)-flow, the DL PDU is originated from a respective        service, and the DL PDU comprises a Paging Policy Indicator        (PPI) associated with the respective service.-   12. The UPF of the embodiment 11, the UPF is further configured to:    -   send the DL PDU to a central unit user plane (CU-UP) of the        radio network node, via a new generation user plane (NG-U)        interface.

Group E Embodiments

-   13. A computer program product comprising instructions, which, when    executed on at least one processor, cause the at least one processor    to perform any of the steps of any of the Group A embodiments, as    performed by the radio network node, or to perform any of the steps    of any of the Group B embodiments, as performed by the UPF.-   14. A computer-readable storage medium, having stored thereon a    computer program product comprising instructions which, when    executed on at least one processor, cause the at least one processor    to perform any of the steps of any of the Group A embodiments, as    performed by the radio network node, or to perform any of the steps    of any of the Group B embodiments, as performed by the UPF.-   15. A radio network node comprising processing circuitry configured    to:    -   receive from a core network, a Downlink (DL) Protocol Data Unit        (PDU) associated with a wireless device, wherein the DL PDU is        comprised in a Quality of Service (QoS)-flow, the DL PDU is        originated from a respective service, and the DL PDU comprises a        Paging Policy Indicator (PPI) associated with the respective        service; and    -   perform paging the wireless device according to the PPI        associated with the respective service.-   16. A user plane function (UPF) in a core network comprising    processing circuitry configured to:    -   send a downlink (DL) protocol data unit (PDU) associated with a        wireless device to a radio network node which is in a radio        access network, wherein the DL PDU is comprised in a Quality of        Service (QoS)-flow, the DL PDU is originated from a respective        service, and the DL PDU comprises a Paging Policy Indicator        (PPI) associated with the respective service.

Numbered Example Embodiments

US1. A radio network node for Paging Policy Differentiation, PPD,wherein the radio network node is configured to be comprised in a radioaccess network and wherein the radio network node comprises a processorand a memory, said memory containing instructions executable by saidprocessor whereby the radio network node is operative to:

-   -   receive from a core network a Downlink, DL, Protocol Data Unit,        PDU, associated with a wireless device, wherein the DL PDU is        comprised in a Quality of Service, QoS,-flow, wherein the DL PDU        is originated from a respective service, and wherein the DL PDU        comprises a Paging Policy Indicator, PPI, associated with the        respective service;    -   extract the PPI by means of a Central Unit User Plane, CU-UP, of        the radio network node;        -   by means of the CU-UP, inform a Central Unit Control Plane,            CU-CP, of the radio network node about the PPI;            -   by means of the CU-CP, trigger paging of the wireless                device; and        -   perform paging the wireless device according to the PPI            associated with the respective service.

US2. The radio network node of US1, further being operative to:

-   -   inform the CU-CP of the PPI by using a DL data notification        message via an E1 interface, wherein the informing is performed        by the CU-UP.

US3. The radio network node of US1 or US2, further being operative to:

-   -   receive, by the CU-UP of the radio network node and via a New        Generation User plane, NG-U, interface, the DL PDU from a user        plane function, UPF, in the core network.

US4. A user Plane Function, UPF, for Paging Policy Differentiation, PPD,wherein the UPF is configured to be comprised in a Core Network andwherein the UPF comprises a processor and a memory, said memorycontaining instructions executable by said processor whereby the UPF isoperative to:

-   -   send a downlink, DL, Protocol Data Unit, PDU, associated with a        wireless device to a radio network node which is in a radio        access network, wherein the DL PDU is comprised in a Quality of        Service, QoS,-flow, wherein the DL PDU is originated from a        respective service, and wherein the DL PDU comprises a Paging        Policy Indicator, PPI, associated with the respective service.

US5. The UPF of US4, further being operative to:

-   -   send the DL PDU to a Central Unit User Plane, CU-UP, of the        radio network node, via a New Generation User plane, NG-U,        interface.

CN1. A radio network node (12) for Paging Policy Differentiation, PPD,wherein the radio network node (12) is configured to be comprised in aradio access network (RAN1) and wherein the radio network node (12)comprises:

-   -   a receiving module (910) configured to receive from a Core        Network (CN1), a Downlink, DL; Protocol Data Unit, PDU,        associated with a wireless device (10), wherein the DL PDU is        comprised in a Quality of Service, QoS, -flow, the DL PDU is        originated from a respective service, and the DL PDU comprises a        Paging Policy Indicator, PPI, associated with the respective        service;    -   an extracting module (911) configured to extract the PPI by        means of a Central Unit User Plane, CU-UP, (12 b) of the radio        network node (12);    -   an informing module (912) configured to inform a Central Unit        Control Plane, CU-CP (12 a), of the radio network node (12)        about the PPI;    -   a triggering module (913) configured to trigger paging of the        wireless device (10); and    -   a paging module (914) perform paging of the wireless device (10)        according to the PPI associated with the respective service.

CN2. The radio network node (12) of CN1, wherein informing module (912)is further configured to:

-   -   inform the CU-CP (12 a) about the PPI by using a DL data        notification message via an E1 interface.

CN3. The radio network node (12) of any one of CN1 or CN2, wherein thereceiving module (910) is further configured to:

-   -   by a Central Unit User Plane, CU-UP, (12 b) of the radio network        node (12), receive the DL PDU from a User Plane Function, UPF,        (15) in the core network (CN1) via a New Generation User plane,        NG-U, interface.

CN4. A User Plane Function, UPF, (15) in a Core Network (CN1) for PagingPolicy Differentiation, PPD, wherein the UPF (15) comprises:

-   -   a sending module (1011) configured to send a downlink, DL,        Protocol Data Unit, PDU, associated with a wireless device (10)        to a radio network node (12) which is in a radio access network        (RANI), wherein the DL PDU is comprised in a Quality of Service,        QoS,-flow, wherein the DL PDU is originated from a respective        service, and wherein the DL PDU comprises a Paging Policy        Indicator, PPI, associated with the respective service.

CN5. The UPF (15) of CN4, wherein the sending module (1011) is furtherconfigured to:

-   -   send the DL PDU to a Central Unit User Plane, CU-UP, (12 b) of        the radio network node (12) via a New Generation User plane,        NG-U, interface.

1. A method performed by a radio network node comprised in a radioaccess network, wherein the method comprises: receiving, from a corenetwork, a downlink (DL) protocol data unit (PDU) associated with awireless device and originating from a service, wherein the DL PDUcomprises a paging policy indicator (PPI) associated with the service;extracting the PPI; using a central unit-user plane (CU-UP) of the radionetwork node, informing a central unit-control plane (CU-CP) of theradio network node about the PPI; using the CU-CP, triggering paging ofthe wireless device; and paging the wireless device according to the PPIassociated with the service.
 2. The method of claim 1, furthercomprising: informing the CU-CP of the PPI by using a DL datanotification message via an E1 interface.
 3. The method of claim 1,further comprising: receiving the DL PDU from a user plane function(UPF) in the core network.
 4. A method performed by a user planefunction (UPF) for paging policy differentiation (PPD), wherein themethod comprises: sending a downlink (DL) protocol data unit (PDU)associated with a wireless device to a radio network node in a radioaccess network, wherein the DL PDU comprises a paging policy indicator(PPI) associated with the respective service.
 5. The method of claim 4,further comprising: sending the DL PDU to a central unit-user plane(CU-UP) of the radio network node, via a New Generation User plane(NG-U) interface.
 6. A radio network node for paging policydifferentiation (PPD), wherein the radio network node is configured tobe comprised in a radio access network and comprises processingcircuitry configured to: receive, from a core network, a downlink (DL)protocol data unit (PDU) associated with a wireless device andoriginating from a service, wherein the DL PDU comprises a paging policyindicator (PPI) associated with the service; extract the PPI; using acentral unit-user plane (CU-UP) of the radio network node, inform acentral unit-control plane (CU-CP) of the radio network node about thePPI; using the CU-CP, trigger paging of the wireless device; and performpaging of the wireless device according to the PPI associated with theservice.
 7. The radio network node of claim 6, wherein the radio networknode is further configured to: inform the CU-CP about the PPI by using aDL data notification message via an E1 interface.
 8. The radio networknode of claim 6, wherein the radio network node is further configuredto: receive the DL PDU from a user plane function (UPF) in the corenetwork via a New Generation User plane (NG-U) interface.